Molar Mass and Percent Composition

The mass of each element per 100 mass unit of compound is called __________.

• percent composition

• molar mass

• mole ratio

• molecular formula

Tags

NGSS.HS-PS1-7

The molar mass of an element is equal to its...

• Atomic mass

• Atomic number

• Oxidation number

• Valence electrons

What are the units of molar mass?

• grams

• moles

• moles/gram

• grams/mole

Tags

NGSS.HS-PS1-7

What percentage of the total atomic mass of carbon monoxide (CO) is composed of carbon?

• 29%

• 43%

• 57%

• 73%

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013

• %Cu= 79.854   %S= 20.145

• %Cu= 35.946   %S= 64.054

What is the percent composition of Benzene, C₆H₆?

• C = 50%
  H = 50%

• C = 85.7 %
  H = 14.3%

• C = 92.2%
  H = 7.8%

• C = 71.9%
  H = 28.1%

Find the percentage composition of Mg in Mg₃(PO₄)₂.

• 27.48% Mg

• 43.11% Mg

• 16.00% Mg

• 12.63% Mg

What is the molar mass of table salt (NaCl)?

• 116.886 g/mol

• 35.453 g/mol

• 22.990 g/mol

• 58.443 g/mol

Calculate the molar mass of Ba(C₂H₃O₂)₂

• 255.3 g/mol

• 237.3 g/mol

• 228.3 g/mol

• 196.3 g/mol

What is the percent by mass of sodium in NaCl?

• 39%

• 61%

• 35%

• 65%

Tags

NGSS.MS-PS1-1